Study on the nitrogen and phosphorous removal effects on eutrophic water by aquatic plants and Daphnia magna

doi:10.14088/j.cnki.issn0439-8114.2021.01.005

Abstract

Abstract: To improve the deficiencies of traditional bioremediation technology and further develop the combined bioremediation technology,based on the biomanipulation theory and the aquatic plant restoration theory,combining with current status of target water bodies,the effects of single organisms and the combination of two organisms on the restoration of eutrophic water were investigated by taking Daphnia magna as the representative of filter-feeding animals,Myriophyllum aquaticum and Ceratophyllum demersum as the representatives of submerged plants.The results showed that D.magna could reduce the concentration of total nitrogen (TN),total phosphorus (TP) and nitrate (NO₃^--N) in water,but not significantly.The concentration of ammonia (NH₄⁺-N) increases with the density of D.magna.The reduction effect of M.aquaticum and C.demersum on TN,TP,NO₃^--N and NH₄⁺-N was significant,especially M.aquaticum’s.Compared with the single D.magna treatment,the submerged plants - D.magna combined treatment has better inhibitory effect on the water nutrients.Both M.aquaticum and C.demersum can significantly inhibit the increase of NH₄⁺-N concentration caused by the excretion and death of D.magna.Among them,the combination of low-density D.magna (25 ind/L) and M.aquaticum has the most significant reduction effect.

Key words: eutrophic, biomanipulation, Daphnia magna, Myriophyllum aquaticum, Ceratophyllum demersum

CLC Number:

ZHANG Chun-xue, WANG Han-yang, WEI Xiao-cheng, ZHENG Xiang-qun, YANG Bo. Study on the nitrogen and phosphorous removal effects on eutrophic water by aquatic plants and Daphnia magna[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(1): 20-26.

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